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Chapter 15
chapter 15
11
Biology
11th Grade
10/20/2013

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Term
Balanced Polymorphism
Definition
Stabilizing selection that maintains a genetic disease in a population because heterozygotes resist an infectious disease
Term
Directional Selection
Definition
Changes in the prevalence of a characteristic that reflects differential survival of individuals better adapted to a particular environment
Term
Disruptive Selection
Definition
A population in which two extreme expressions of a trait are equally adaptive
Term
Founder Effect
Definition
Genetic drift when small groups found new settlements, partition a subset of the original population's genes
Term
Gene Flow
Definition
A change in a gene pool due to the random loss or addition of alleles through migration
Term
Gene Pool
Definition
All the genes in a population
Term
Genetic Drift
Definition
Changes in gene frequencies caused by separation of a small group from a larger population
Term
Genetic Load
Definition
Collection of deleterious alleles in a population
Term
Hardy-Weinberg Equilibrium
Definition
Maintenance of the proportion of genotypes in a population from one generation to the next
Term
Population Bottleneck
Definition
A type of genetic drift. An event kills many members of a population, and a small number of individuals restore its numbers, restricting the gene pool
Term
Stabilising Selection
Definition
When extreme phenotypes are less adaptive than an intermediate phenotype
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